Cited by 303interferon and immune responsesImmune Response and InflammationDNA and Nucleic Acid Chemistry

Tight nuclear tethering of cGAS is essential for preventing autoreactivity

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Volkman, Hannah E, Cambier, Stephanie, Gray, Elizabeth E, Stetson, Daniel B·2019·eLife

Abstract

cGAS is an intracellular innate immune sensor that detects double-stranded DNA. The presence of billions of base pairs of genomic DNA in all nucleated cells raises the question of how cGAS is not constitutively activated. A widely accepted explanation for this is the sequestration of cGAS in the cytosol, which is thought to prevent cGAS from accessing nuclear DNA. Here, we demonstrate that endogenous cGAS is predominantly a nuclear protein, regardless of cell cycle phase or cGAS activation status. We show that nuclear cGAS is tethered tightly by a salt-resistant interaction. This tight tethering is independent of the domains required for cGAS activation, and it requires intact nuclear chromatin. We identify the evolutionarily conserved tethering surface on cGAS and we show that mutation of single amino acids within this surface renders cGAS massively and constitutively active against self-DNA. Thus, tight nuclear tethering maintains the resting state of cGAS and prevents autoreactivity.

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  • cGAS is suppressed by binding to nucleosomes and disruption of nucleosome regulation enables robust DNA-dependent activation of cGAS.

    “Previously, we and others showed that cGAS is suppressed by binding to nucleosomes and that disruption of nucleosome regulation enables robust DNA-dependent activation of cGAS32–37 (Fig. 4a).”

    From cGAS–STING drives ageing-related inflammation and neurodegeneration (2023) · cites this paper as [37]

    The Results section, “Identification of the evolutionarily conserved cGAS tethering surface,” shows that disrupting nuclear tethering produces strong, DNA-dependent activation of cGAS. But the Discussion says the identity of the chromatin tether remains unclear and does not establish that binding to nucleosomes is what suppresses cGAS; it describes nucleosome-binding evidence from an in vitro study as of uncertain relevance to its findings in cells. Page numbers are unavailable in our copy. (LLM, conf=0.88)

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Authors
Volkman, H. E., Cambier, S., Gray, E. E., & Stetson, D. B.
Affiliations
University of Washington (US)
Corresponding author
Stetson, Daniel B
Venue
eLife
Published
2019-12-06
Volume
8
ISSN
2050-084X (ISSN-L)
OpenAlex
W2994585472
Cited by
303
References
42
Citations by year
2026: 38 · 2025: 42 · 2024: 55 · 2023: 36 · 2022: 37 · 2021: 59 · 2020: 36
FWCI
13.19
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health (AI084914)
  • Jane Coffin Childs Memorial Fund for Medical Research
  • Burroughs Wellcome Fund (1013540)
  • Howard Hughes Medical Institute (55108572)
  • Bill and Melinda Gates Foundation (OPP1156262)
  • Cancer Research Institute (A84161)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
cGAS, innate immunity, double-stranded DNA sensing, self-DNA, autoreactivity, chromatin, cytosolic DNA sensing, constitutive activation, nucleic acid sensors
MeSH terms
Cyclic Guanosine Monophosphate-Adenosine Monophosphate Synthase, Animals, Cell Nucleus, Cells, Cultured, Cytosol, DNA, DNA Damage, HeLa Cells, Humans, Mice, Inbred C57BL, Nuclear Proteins, Nucleotidyltransferases, Protein Binding, Cell Line, Tumor, DNA Cleavage

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